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  2. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    The residence time of a reservoir within the hydrologic cycle is the average time a water molecule will spend in that reservoir (see table). It is a measure of the average age of the water in that reservoir. Groundwater can spend over 10,000 years beneath Earth's surface before leaving. [17] Particularly old groundwater is called fossil water ...

  3. Hydra vulgaris - Wikipedia

    en.wikipedia.org/wiki/Hydra_vulgaris

    Hydra oligactis. This species can reproduce in three ways: sexual reproduction, budding, and indirectly through regeneration. [11] When hydra reproduce sexually, simple testes, ovaries, or both will develop on the bodies of an individual. Sperm released into the environment by the testes enters the egg within the ovary.

  4. Lake retention time - Wikipedia

    en.wikipedia.org/wiki/Lake_retention_time

    The lake retention time for a body of water with the volume 2,000 m 3 (71,000 cu ft) and the exit flow of 100 m 3 /h (3,500 cu ft/h) is 20 hours.. Lake retention time (also called the residence time of lake water, or the water age or flushing time) is a calculated quantity expressing the mean time that water (or some dissolved substance) spends in a particular lake.

  5. Hydra (genus) - Wikipedia

    en.wikipedia.org/wiki/Hydra_(genus)

    Some Hydra species, like Hydra circumcincta and Hydra viridissima, are hermaphrodites [12] and may produce both testes and ovaries at the same time. Many members of the Hydrozoa go through a body change from a polyp to an adult form called a medusa , which is usually the life stage where sexual reproduction occurs, but Hydra do not progress ...

  6. Water year - Wikipedia

    en.wikipedia.org/wiki/Water_year

    A water year (also called hydrological year, discharge year or flow year) is a term commonly used in hydrology to describe a time period of 12 months for which precipitation totals are measured. Its beginning differs from the calendar year because part of the precipitation that falls in late autumn and winter accumulates as snow and does not ...

  7. Time–distance diagram - Wikipedia

    en.wikipedia.org/wiki/Time–distance_diagram

    A time–distance diagram is a chart with two axes: one for time, the other for location. The units on either axis depend on the type of project: time can be expressed in minutes (for overnight construction of railroad modification projects such as the installation of switches) or years (for large construction projects); the location can be (kilo)meters, or other distinct units (such as ...

  8. Hydra: The Greek island of calm where cars are banned and ...

    www.aol.com/hydra-greek-island-calm-where...

    Jarman’s connection with Hydra began 24 years ago when her mother brought her to the island on vacation, leading to a life-changing decision to make Hydra their permanent home.

  9. Tide table - Wikipedia

    en.wikipedia.org/wiki/Tide_table

    Tide prediction was long beset by the problem of laborious calculations. Before the use of digital computers tide tables were often generated by the use of a special-purpose calculating machine, the tide-predicting machine .